Jefferson Lab Weekly Briefs November 30, 2016
Jefferson Lab Weekly Briefs
November 30, 2016
12 GeV Upgrade
In Hall C, the Super High Momentum Spectrometer (SHMS) Q2 magnet has been completely installed, connected, purged and filled with liquid helium. Low-power testing commenced on Nov. 23. The Dipole magnet has been lowered to its final position. The front wall of the shield house was installed over the Dipole, and a work platform has been erected above. Alignment of the Dipole's cryogenic control reservoir on the roof of the shield house is ongoing. Experts from the magnet manufacturer are on site to make the final superconducting connections between the current leads and the magnet coil. The last SHMS magnet, Q3, has left Europe on a ship headed to Norfolk. It is expected to arrive during the first week of December.
Reorganization of the Hall C SHMS quartz-bar hodoscope detector elements is finished. This activity placed the bars with the best photomultiplier tubes in positions near the middle of the array. Such a configuration will allow the timely demonstration of the detector performance needed to meet the 12 GeV Project construction milestone. Gas is flowing through the installed drift chambers and all connections to them are complete.
In Hall B, the five coils of the Solenoid magnet were joined into one assembly by suspending the bobbin with the four Inner and Intermediate coils inside the Shield coil bobbin. The several hundred copper “cooling fingers” are now being attached between the three radial sections of the overall coil, forming the main path to conduct heat to the helium reservoir. The inner and outer surfaces of the coil have been covered in reflective aluminum tape. Planning for shipping the Solenoid to Jefferson Lab is now underway, including design of the shipping cradle and isolation springs needed for the road trip to Virginia.
Hall B continues to install the region 3 drift chambers with five of the six in place. Part 2 of the Director’s Review of the Hall B Installation and Commissioning plan was held on Monday, Nov. 21. The committee recognized the progress made to optimize the schedule for the remaining work. However, the committee raised concerns about the current staffing level and encouraged leveraging all efforts to further advance the schedule.
Research Planned for Unique Spinning Nuclei Nets Prize
Nominate A Colleague for the 2017 Outstanding Nuclear Physicist Award
Center for Theoretical and Computational Physics
A new Joint Physics Analysis Center paper studies the photoproduction of η mesons, using the framework of Finite Energy Sum Rules to match the information from the resonance region with data in the high-energy regime. This approach allows one to constrain the unknown Regge couplings, and to predict the energy dependence of the beam asymmetry at high energies.
Facilities Management and Logistics
Bicycles and Golf Carts Are Not Allowed on Walking Paths
Jefferson Lab Calendar of Events
Dec. 2: All-Hands Meetings
Environment, Safety, Health and Quality
Use Extra Caution When Working Near Radiological Rope Boundaries
Give radiological boundaries a little extra buffer, and if you need to work directly adjacent to a boundary, contact the Radiation Control Department for advice. Follow the simple rules below to ensure good radiological performance and maintain your dose as low as reasonably achievable (ALARA).
Remember, you can’t see, smell or feel radiation, so you must rely on the boundary designation to ensure your safety. Never make assumptions about radiological hazards near boundaries, and contact the Radiation Control Department if you have any questions about radiological conditions.
Computing and Networking Infrastructure
Two-Factor Authentication Cryptocard System Outage on Thursday Evening
Tornado Warning Siren Test Set for 10:30 a.m. on Friday, Dec. 2
Toys for Tots Toy Drive
Holiday Party on Dec. 10 for Jefferson Lab Children and the Young at Heart
Volunteers Needed for the JAG Holiday Party
Ready, Set, Hang Those Decorations
Sentara Mobile Mammography Unit On-Site January 13
Check the Lost and Found for Your Missing Stuff
TIAA-CREF 401(k) GSRA Open Enrollment Is Underway
Santa’s Sleigh Dogs Deliver Donations to Mayflower Marathon Food Drive
D&I Council Seeks Jefferson Lab Community Input
|JLab Weekly Briefs is an ongoing publication providing information on the status of safety, accelerator operations, experiments, free-electron laser, reviews, upcoming activities and special events. Deadline for submission is every Tuesday by 10 a.m. Submit new items to: Public Affairs or contact Kandice Carter at x7263.|